"Mj" wrote in message
...
"Rick" wrote in message
oups.com...

We have 600+ roof slates, with patches of tar on them. We can get most
off with a scraper, but have some stubbon bits. Any ideas how I can
get 400 of them clean?

I am happy to loose some on the way.

I have tried heating the tar, by the time it comes off, the slate is
popping, and bits are firing at me.

Thanks
Rick



Soak in paraffin until you can brush off then rinse wash in washing up
liquid and water.