Try soy solvent - this Glysol PC product has had great sucess with replacing harsh chemical cleaners - Rich Soble is a great guy to work with too - tell him I told you I heard his soy solvent was the best one on the market!
Powerful bio-based parts cleaning fluid derived from soybeans and other natural sources. Glysol PC replaces mineral spirits, PD680 Type II, Stoddard Solvent and similar petroleum-derived solvents in manual and immersion-type parts washers. It's safer, cleans better and lasts longer. Pleasant to use ? low toxicity, no unpleasant fumes or skin irritation. Non-polluting, biodegradable.