Is there a type of chain lube that has tiny particles in it? I cleaned the chain of my brand new bike last week and was alarmed that it was full thick, black gritty gunk. I ran it through my washer thingie and it was still gritty and gunky. I then spent what seemed like hours wipe,wipe,wiping away at that grit. I never did get rid of it compeletly. The lube I use is clear, thin and entirely grit-free. I happened to take the bike back to the shop this week because of a braking issue (I was having to use my feet to stop on hills) and was assured that the bike was going to get a thorough "tuneup". When it came back, it was loaded with thick, black, gritty gunk! (and had a rattle it didn't have before). The grit is very very fine, but seems to me to be about the same consistency as an abrasive cleanser. To my newbie brain, that seems like something you would absolutely NOT want in your chain! Am I wrong?