Nah. I've been using spray engine degreaser on my drive trains for as long as I can remember. I just spray it on, wait about two minutes and rinse it with a hose (not a high pressure hose.) You can't get anything into the hubs without pressure. Everything gets squeaky clean. I bounce the bike on the ground a couple of times to shed most of the water and let it dry. Then I lube the chain. I've done it countless times. I know people who actually remove the chain to clean it and use toothbrushes on the cassettes and derailleurs. What a hassle. I like clean bikes but I would ride dirty ones if that's what I had to go through.