Bowling ball cleaners applied after each session remove surface oil and lane conditioner from the coverstock. But over dozens of games, oil penetrates deeper into the porous reactive resin coverstock than surface cleaners can reach. This absorbed oil changes how the ball reacts — reducing hook, dulling the backend response, and making the ball behave differently than when it was new. A proper deep wash — sometimes called a "baking" or hot water extraction — pulls this embedded oil out and can restore the ball's original performance characteristics.
The Hot Water Soak Method
This is the most effective home method for deep cleaning a reactive resin bowling ball. It uses the principle that oil becomes less viscous at higher temperatures and will migrate out of the coverstock pores when given a path to do so.
What you need: A bucket large enough to submerge the ball, hot water (not boiling — around 140°F / 60°C is ideal), dish soap or a USBC-approved ball cleaner, microfiber towels.
Step 1: Fill the bucket with hot water and a small amount of dish soap. The water should be hot enough to be uncomfortable to hold your hand in, but not boiling.
Step 2: Plug the finger holes with tape or waterproof plugs. Water infiltrating the finger holes can damage the inner workings and cause issues.
Step 3: Submerge the ball completely. You'll often see oil begin to appear on the water surface within minutes — that's the embedded oil migrating out.
Step 4: Let soak for 20–30 minutes. Remove, wipe clean with a microfiber towel, rotate the ball so a different section faces up, and repeat the soak.
Step 5: After 2–3 soaks, wipe the ball dry thoroughly and let it air dry at room temperature for several hours before bowling with it.
The Oven Method (Use With Caution)
Some bowlers use a very low oven (around 140°F) to warm the ball and draw out oil onto towels wrapped around it. This can be effective but carries risks: too high a temperature can damage the coverstock, warp the ball's shape, or damage finger inserts. If you use this method, never exceed 140°F, monitor the ball closely, and check every 15 minutes. The hot water method is safer and equally effective for most balls.
What About the Finger Holes?
Plug them before any wet cleaning. Even in the hot water method, prolonged water exposure in the finger holes can cause issues with inserts, the inner hole surface, and — in rare cases — can introduce moisture to the ball's core through hairline cracks. Waterproof tape or purpose-made finger hole plugs (available at pro shops for a few dollars) prevent this.
How Often Should You Wash Your Ball?
| Bowling Frequency | Deep Wash Interval |
|---|---|
| Casual (a few times a year) | Once per year or when performance drops |
| League (weekly) | Every 50–75 games (roughly every 2 months) |
| Competitive (multiple sessions/week) | Every 30–50 games (monthly) |
| Tournament prep | Before major events regardless of game count |
After Washing: Restore the Surface
A deep wash strips not just oil but also some of the surface treatment from the coverstock. After washing, your ball may hook slightly differently than before — often a bit more on the backend because the surface is now closer to its original unmodified state. Apply your preferred surface treatment (polish for more length, sanding for earlier friction) after washing to return the ball to your target performance profile.