i use what the owner's manual recommends: kerosene. works great, safe on the chain and cheap!
Kerosene works well as others said, just make sure you don't try and Cheat and have the bike running in gear on the stands, good way to lose a finger....
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good "scientific study" on the effects of various cleaners on O-rings (not a good outcome for WD-40)
PART II WD-40 O-ring exposure effect results - ADVrider
If you read my post, I said ON A RAG. I do not spray WD on the chain. I spray it on a rag and wipe the chain with it. Kerosene does the same thing as WD, it will dry out rubber.
What little is on the rag does not affect the O-rings any....
Not exactly a nationally recognized lab or method
ANY petroleum distillate will, eventually have a negative effect on rubber parts. Motor oil, gasoline, penetrating oil, kerosene, etc. UNLESS that rubber was designed to be in contact with those products.
That is why I just wipe it with a rag sprayed with the WD. As often as I cange chains, it would not matter anyway