Can You Sand or Polish Your Ball During League? The USBC Rule, Explained

It happens in every house. Third game, the lanes have broken down, and somebody pulls an Abralon pad out of their bag and starts scuffing up their bench ball right there in the settee.

Half the team says nothing. One guy says something. Then the argument starts.

Here is the answer, and it is not close.

The short answer

No. Once league starts, you cannot touch your ball surface.

No abrasives. No cleaner. No polish. No rosin. Nothing but a dry towel.

That is USBC Rule 18, and it has been on the books since August 1, 2019. Most league bowlers still get it wrong, which is why we are going through the whole thing line by line.

What USBC Rule 18 actually says

Straight from the current USBC Playing Rulebook, Rule 18, Bowling Ball – Altering Surface:

While bowling in USBC competition, a bowling ball cannot:

• a. Have the surface altered by the use of an abrasive.
• b. Be cleaned with any liquid substance or cleaning agent.
• c. Have any foreign material on it including, but not limited to, powder, rosin, marker or paint.

And then the part that stings:

All bowling balls so altered or cleaned must be removed from the competition.

There is one carve-out. If a foreign substance shows up on your ball that you cannot get off with a dry towel, an approved cleaner may be used, but only with consent from a league or tournament officer. You ask first. You do not clean first and explain later.

That is the whole rule. Three lines and one exception. Bowlers call it the dry towel rule, and the nickname is accurate.

When does competition actually start

This is the part people trip on.

Competition starts once any bowler throws a ball for score in your league or tournament. Not when you throw. Not when your team is up. When anybody in the house on your league throws the first shot that counts.

Practice is not competition. During practice you can sand, polish, and clean all you want. The second scoring begins, the window closes for the night.

So if your league does ten minutes of practice and then the lights go on, that is your deadline. After that, whatever surface is on your ball is the surface you are stuck with.

Yes, that includes the ball still sitting in your bag

This is the one that catches good bowlers.

Rule 18 covers balls that have not been introduced into play yet. USBC spells it out: you cannot clean a ball from your bag, your locker, or your car once competition has started, even if you have not thrown it a single time that night.

Picture the classic scenario. You leave a 10 pin, you reach for your plastic spare ball, and you give it a quick shot of cleaner before you throw it because it has been sitting since last week.

That ball is now illegal for the rest of the session. It has to come out of competition.

Clean every ball in your bag before you leave the house. That is the fix, and it costs you nothing.

What you can still do during league

The rule is strict, but you are not helpless. Here is what is still legal once scoring starts:

• Wipe with a dry towel or dry shammy. Every shot if you want. This is the whole approved toolkit, and you should be using it. Oil left sitting on the cover soaks in.
• Change your thumb tape or finger tape. Tape in the grip holes is not a surface alteration.
• Remove residue from inside a hole with permission from a league officer.
• Use an approved cleaner on a foreign substance you cannot towel off, again with permission from a league officer or tournament official first.
• Clean with an approved cleaner during practice, unless your league or tournament specifically says otherwise.

Notice how much of that list depends on asking someone first. When a lane machine leaves a streak on your cover or you pick up something off the approach, do not just handle it. Flag down an officer, get the yes, then clean it.

The “USBC Approved Anytime” bottle that is lying to you

Dig through your bag right now. If you have an older bottle of cleaner, there is a decent chance the label says something like “USBC Approved Anytime.”

That label is dead. It refers to an older version of the rules where approved cleaners could be used during competition. Rule 18 killed that in 2019. Those bottles stayed on shelves until inventories ran out, and plenty of them are still floating around pro shop shelves and bowling bags.

The bottle does not override the rulebook. If it is liquid and it touches your ball while score is being kept, you are in violation, no matter what the sticker says.

USBC still maintains an approved and non-approved products list, and “approved” now means approved for use outside of competition, or during competition only in that permission scenario above.

What happens if you get caught

The penalty depends on whether you knew better.

If you did not know the rule, the ball comes out of competition and somebody explains the rule to you. That is it. No score wiped, no drama.

If you did know the rule and did it anyway, the ball comes out and your games are subject to forfeiture. If there is a dispute about whether you knew, the league board of directors decides.

Refuse to pull the ball? Games are subject to forfeiture.

For serious league bowlers chasing an 800 series or a clean season, that risk is not worth a mid-set surface tweak that probably would not have saved the game anyway.

The uniform surface rule people forget

Here is a bonus one that even careful bowlers miss.

You cannot hit just the track. USBC requires the entire surface of the ball to be prepared in a uniform manner. Scuffing only the track flat, or polishing just the strip where the ball rolls, is a violation of the specifications, and the penalty can include disqualification, forfeiture, removal from the league, or suspension of USBC membership.

So even at home, when you take a pad to a ball, take it to the whole ball. Spin it, cover every panel, keep it even. Spot-sanding your track is not a shortcut. It is a rules problem and a ball reaction problem at the same time.

Same logic applies between events. If a tournament runs singles and doubles back to back as one competition, you cannot change surface between them. Once the tournament starts, it is started.

So plan your surface before the first ball

If you cannot adjust surface during league, the adjustment has to happen earlier. That is the real takeaway here, and it is a better way to bowl anyway.

1. Set your surface in practice, on purpose. Do not walk in and guess. Throw a few, read the lane, and if the ball is too clean or too early, fix it before scoring starts. Once you know what your house plays like, you should be showing up with the right surface already on.

2. Carry surface variety instead of one ball you keep changing. This is the whole argument for a real arsenal. Instead of one ball you scuff and polish all season, bring a dull one, a mid one, and a shiny one. Then your “surface adjustment” is just switching balls, which is completely legal at any time. Our 3-ball arsenal breakdown covers exactly how to build that for a single house pattern.

3. Know what surface actually does before you change it. Dull reads earlier and burns up sooner. Polished skids longer and snaps harder. If you are not clear on which one your game needs, start with polished vs sanded and pick with intent instead of guessing.

4. Keep a resurfacing schedule. Most of the “my ball died mid-season” problems are really “I never resurfaced it” problems. Here is how often you actually need to resurface based on games thrown.

5. Clean everything the night before. Every ball in the bag, cleaned and toweled before you leave. Then you are never tempted to reach for a bottle in the settee.

If you need a fresh surface put on properly, a pro shop with a spinner will do a better job in ten minutes than any of us will do by hand in the parking lot. And if you want to rep the crew while you are at it, our pro shop has you covered.

Frequently asked questions

Can you sand your bowling ball during league?
No. Once any bowler throws a ball for score, abrasives are prohibited for the rest of the session. You can sand during practice, before scoring starts.

Can you clean your bowling ball between games in league?
No. Rule 18 prohibits cleaning a ball with any liquid substance or cleaning agent during competition. Games are part of competition. A dry towel or dry shammy is all you get.

When does competition officially start in bowling?
When any bowler in your league or tournament throws the first ball for score. It does not have to be you, and it does not have to be your team.

Can I clean a ball I have not thrown yet?
No. USBC applies Rule 18 to balls that have not been introduced into play, including balls from your bag, locker, or car. Clean everything before competition starts.

What happens if you sand your ball during competition?
The ball must be removed from competition. If you knew the rule and did it anyway, your games are also subject to forfeiture.

Can you use rosin or powder on your ball during league?
No. USBC counts rosin, powder, marker, and paint as foreign material. Patting the ball and wiping it off does not fix it. Products go on your hand, not on the ball.

My ball came back with junk on it. Now what?
Try a dry towel first. If that does not remove it, take the ball to a league officer or tournament official and ask permission to use an approved cleaner. Get the yes before you clean, and you may clean the entire ball.

Can I change surface between events at a tournament?
Not if the events run as one competition. USBC specifically says you cannot alter the surface between concurrent events like singles and doubles once the tournament has started.

Does my “USBC Approved Anytime” cleaner still count?
No. That labeling predates the 2019 rule change. The bottle does not override Rule 18.

Can I sand just the ball track?
No. The entire surface has to be prepared uniformly. Spot-sanding the track violates USBC ball specifications and carries penalties up to suspension.

10th Frame Final Thoughts

Rule 18 is one of the easiest rules in the book to follow and one of the most commonly broken, because the habit of cleaning a ball between games is older than the rule that banned it.

Dry towel during competition. Everything else before or after. That is it.

And honestly, the rule makes us better. If you cannot fix the ball mid-set, you have to fix the shot, the line, or the ball in your hand. That is the part of the game worth getting good at anyway.

Clean the bag the night before, set your surface in practice, carry the arsenal that covers the transition, and let the towel do the rest.

Stay hungry. Go down swinging.