Those 3 guys are not in that bad condition, they are actually better than most despite residing under the flower pot for the last 20 years
Since they don't seem discolored, the H2O2 bath seems redundant. They appear to be just dirty. Give them a good clean with babywipes and then reassess their condition.
Streetwise may not be as deteriorated as he looks. Try to remove the metal chest an use some car polish on it until you remove all the grime and rust until you get to the shiny metal. There will be some imperfections on the surface but it will like 1000 times better than it does now.
Dirst Aid just needs a clean up and some reprolabels.
When it comes to blades, clean him up and see if you can make a 'prosthetic' piece for his broken skid and super glue it in and then paint it white.