Cartman57

Drivers door jam there is a manufacture nameplate, lower left code should be color next is trim i.e. C/TR : 6T9/LA04

I'm sure it's not a cheap replacement part or anything serviceable inside even with contact cleaner. The carbon or contact on the potentiometer is probably worn down and has dead spots. (nice mods on your vehicles BTW)

check this out, but only to the seat heater portion. http://us.lexusownersclub.com/forums/index.php?showtopic=62405&st=0&p=400522&hl=+radio%20+removal&fromsearch=1entry400522

Solution was to remove the cover so the wiper arm can be lifted up higher off the glass then the blade can be removed, it's a 'j hook' style just like the front. If the cover is not removed the arm can't be lifted high enough. Use a small flat blade screwdriver, one side the the other to release the tabs, it'll pop off. Like Lemon said, easier to replace the whole blade not the squeege portion, difficult to find just a blade that'll fit in the same slot, trust me, I've done a few the cheap way from old but good ones only to buy the whole blade.

Any auto store will have direct replacements, near the wiper arm at the pivot point, gently pull off the cover on the arm(will expose the nut holding the arm on) this will allow the arm to move up away from the glass more, pull off the old, replace with new blade. I've tried to replace just the rubber blade before on other vehicles, it's not worth the time, they're cheap enough. Edited to add: Trico Exact Fit Windshield Wiper Blade Part No. 14-A Advance Auto $11.99 RockAuto $7.98 Anco Wiper Blade Part No. AR14A O'Reilly $9.99 RockAuto $6.30