Cleaning White Interior

A strong chemical like wesleys or purple power will eat up the sewing thread.
You can't rinse it enough to get that stuff out. The water evaporates and leave full strength corosive chemicals behind.
I wont use anything stronger than the creme type hand cleaner like GoJo or M30 for laundry on seat covers. Works great on leather too.

Thanks Red. I am familiar with GoJo but not M30 (which I am sure is very similar). I want to try the least abrasive/corrosive products first. If they don't work, I may still try Wesleys (cut way down) and be extremely careful about keeping it away for the threads. Maybe laying some blue tape over them and applying the Wesleys with an applicator pad and/or fine toothbrush as to get close to them but not actually touch them.