I've been with many different version of Plotong for many years. When I handle powah windoe rosak, the 1st thing I check is whether motor is working. If working, then the rest is easier. Do not use WD40(unless temporary measurement). WD40 is oil base lubricant, if you spray it, it will not dry on the spot but start accumulating dust. In the long run, the supposed lubrication oil of WD40 become a ball of dust and start griding your powah windoe component. For powah windoe motor, recommended lubrication is GREASE. Get a small box of grease, apply it on the machine area on all angle with your finger.

For screeching sound, 1st thing to check is your window lining. This is the area where easy accumulate dust, especially for the smoker. Smoker often leave the window wide open, even mild raining. The window lining is supposed to ensure the glass window does not flick and well kapit at the door frame. Dust tend to hide inside this area. Often when I receive a car with powah windoe rosak, I'll pull out the window lining, use degreaser spray to clean up the lining inner part. Apply a little industrial alcohol to clear up the surface to make sure degreaser being totally wipe off. Finally, apply SINGER lubricant(if you remember zaman ibu kita use it to lubricate the sewing machine) on the lining then slot it back. Most of the time the powah windoe work like a charm and can last very long. Normally can last about a year before you apply lubricant again (on the side line, you may use tyre shine as well, but smell 1 of a kind la, SINGER oil no smell)
Your right foot problem la
Great piece of advice bra  dagreat SiuYi I've heard before I join LYN

Tered moving slow. Tell your buttsecks partner to standby