Old egg on stuco

Chris, if the egg stain has been on there for a year or more I highly doubt that its gonna come off. At least not without still leaving a stain of some sort on the paint. That is, if there is any paint on there at all.

I've had decent luck in the past using a butyl based sodium hydroxide. Slight agitation and low PSI. Of course the ones I removed were not on there for a year either.
 
Magic Eraser and Vaseline.
 
I've had decent luck in the past using a butyl based sodium hydroxide. Slight agitation and low PSI. Of course the ones I removed were not on there for a year either.

I would go with potassium hydroxide. We took old egg off of some stain glass windows. I'm not sure it was a whole year old, but at least 3 months. We used about 1/4 cup to a 3 gallon pump up sprayer then made it a little stronger in a few places around the lead joints. Rinse well!
 
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