I treat all of my windshield wiper blades with Aerospace 303. I have a section of 3" PVC long enough to fit my longest blades, capped at one end and a screw on cap on the other. I buy multiple sets of wipers for all my cars through rockauto in one buy to maximize shipping cost. To treat them, heat up the rubber blades with a heat gun and put em in the pipe, as many as it can hold, fill it with enough 303 to cover the blades when it lies flat and screw the cap on. Let em soak over night. Give 'em a good wipe down and install them. Pour the 303 back in the jug for later use. The wipers last for years and usually have to be replaced because the blade section rips apart from the base but otherwise they would still wipe just fine. If they start to look a little grimy, you can just put some 303 on a paper towel and clean them off. For my B2200 I put Trico Ultras on in 2021 and I just noticed the other day that the blade is starting to tear, so I have some Anco Contours ready to replace them with.
You can also soak your alternator/ac/power steering belts in the 303 and they'll last a really long time. For those I just let em heat up in the sun before soaking them. I also use 303 to wipe down/soak any rubber pieces like door seals/hood stops, or plastic parts like dashes, center console, etc and it'll keep the rubber supple and protect them from UV and it doesn't leave an oily residue like Armor All and some other products do.
I've read that you can heat up timing belts in the oven at low heat to really open up the pores and then soak them in 303 and they'll last pretty much forever. I have yet to change a timing belt myself, so haven't tried it yet.
