Just replace them.
Lets say you take them apart, clean them and put them back together and they're holding enough that you can't pull them out...that's like 1/20 what they have to hold in an accident. Down the line you have a minor accident and see 5Gs. ballpark 150lbs x 5Gs=750 lbs Wanna risk it when you've only tested it to 100 lbs?