I've tried almost everything to clean chains. Brake and parts cleaner is bad,it says "donot put on rubber parts" right on the can. I thought about carb cleaner since it's ok for the o-ring,seals,etc in a carb but it has alcohol in it. Simple green and purple stuff are degreasers so if they make it past the o-ring there goes your lubrication. Chain cleaner is expensive and can be hard to find. So I'm back to penetrating oil or kerosene (which can be messy),so mostly penetrating oil. Oh and I'm using the Amsoil HD chain lube. It comes in a HUGE can for about $6.
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