how do I get ivy suckers off a rendered outside wall?

I've taken ivy down from a rendered wall but the suckers stuck fast, then a stupid painter painted over the suckers (after telling him they had to come off before painting) any ideas on how to get it back to normal?
jules, May 2013


done
I hardly think the painter was stupid - painters paint - it is not the job of a painter to attend to weeds. This is down to weak project management.

Peccavi, May 2013
Wire brush and vigorous action.

Scraper perhaps...

http://www.amazon.co.uk/Silverline-CB35-Heavy-Duty-Scraper/dp/B000LFXFPQ/ref=sr_1_8?ie=UTF8&qid=1369945393&sr=8-8&keywords=floor+scraper

Peccavi, May 2013