I usually follow the pinrepair method of alcohol and then a light sanding followed by some gel lube. Seems to work wonders and usually negates the needs to adjust the springs most of the time.

http://www.pinrepair.com/em/index1.htm

NO electrical cleaner!!! ever...

usually step 1 with steppers is "take apart and clean thoroughly"... you are on the right track, they tend to gum up over the years... it is unlikely the disk itself that is the problem in your case, it is more likely that the pawls are "sticky" (especially any that are mounted with shoulder bolts)...

take it out of the machine, and take a LOT of pictures during disassembly... it isn't hard to do, it just looks hard... there are descriptions both on the site linked in the previous post and on pinwiki that will guide you through it... read through those descriptions carefully...

as far as cleaning the disk goes, i have found that degreasing/cleaning it with something like mean green, and then using brasso to polish up the rivets (instead of sandpaper) works really well... i used to use the sandpaper method, but tried the brasso on a suggestion from pinsider stashyboy, and much prefer that method...

to clean everything else, if the parts are zinc plated, mean green works well... if you have an ultrasonic cleaner, all the better... if it is one of those gottliebs that have the "bronzy" parts, zep heavy duty citus degreaser works the best...

plenty of people here to help... if you are going to own em's, learning to rebuild steppers is one of those things that is necessary...