The Side Swiper is one of the old stand-by window tint installation tools. It's ideal for prepping or getting that last bit of slip solution out of those tough spots in the corner of lower rear deck areas  and windshields on automotive tint jobs. 
 
Options Include:
Sledgehammer (yellow) - rated @ 93 durometer, this is our hardest blade
De-Hydra (white) - rated @ 90 durometer, this is our medium hardness blade
Cyclone (red) - rated @ 87 durometer
Judge (orange) - rated @ 79 durometer, this is our softest blade