i use a chemical called "omph" its a domestic product and there are similar substitutes. It is used to remove stickers and the sticker residue without damaging plastic or paint. Its the best thing since sliced bread.
soft toothbrush and warm water to clean.
turps (sparingly!) and babywipes for sticker removal.
plain old 3-tubes-for-$2.50-from-bunnings superglue to repair broken bits and coat mating surfaces of joints to restore new levels of tightness.
pretty much all my G1's have been subjected to these processes at some stage.
TF Figs of 2024:
1) Legacy Magmatron
2) Legacy Gears
3) SS102 RotB Optimus
I use super glue for internal joints and pieces but you got to know what you are doing as a mistake can be costly but it dries very quickly. For joints, keep moving the joint until the glue dries so that it doesn't stay 'fixed' in place.
For cleaning toys I use an electric toothbrush with soft bristles, warm soapy water, and cotton swabs or q-tips. You need to be careful on areas near stickers so as to ensure that you don't get them wet.
So using some small blobs of super glue on joints usually makes them stiff again (for example Optimus' shoulders)?