[Texasrocker]

A couple good pro-tech fast-cleaners I have found in the past for these type "heavy" cleanups are in spray-cans avail from electronics supply houses. One is called "Blue Shower", and the other is " Big Bath". Either type quickly removes, disolves, ALL dirt, grit, grease, etc type debris accumulated over many yrs. It dries very fast, and leaves printed circuit boards,metal chassis, etc looking like new! Just make sure you dont accidentally get the overspray on other various type plastic parts, such as dialcovers,dialscales, cabinets,knobs,etc. The cans have instructions, and are abit pricey, but a can lasts a long time, and saves many hrs of chassis cleaning labor indeed!