Don’t leave your dolls in the sun when it’s extremely hot. Their vinyl skin can soften, and actually become deformed. Remove your dolls from the sun every two hours or so to prevent damage and apply more cream, if necessary. Let their skin cool before putting them back out into the sunlight.
Some stains may take a couple of weeks to fully work out. Be patient, and keep repeating the process until you are satisfied with your result.
Tie their hair out of the way before you apply paste to their face. Be careful not to get water in your doll’s eyes, which can cause rusting.