Yes, Rubbing Alcohol (Isopropyl) is okay to use. It's USBC legal for anytime use.
It's a okay surface cleaner, it might not remove somethings like belt mark unless you apply a lot of elbow grease.
Also it won't harm the ball (That's just a old rumor that's been around for years).
While technically not USBC legal or illegal, a common DIY ball cleaner that is a little more effective is a 50/50 mix of Rubbing Alcohol (Isopropyl) and Simple Green cleaner. Many swear by it and is a cheap alternative cleaner.
While the stuff sold in the proshop does cost more, some of them are more effective cleaners (some not).
But if your on a budget Alcohol or the 50/50 mix will do okay.
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