wrote:
Some grafitti has been spayed on a nearby wall overnight and I'd like
to hasten its removal.

It's constructed of "blue brick" which it fairly smooth and I'm told is
extremely hard.

I believe that a problem with applying paint stripper to brickwork is
that it can be absorbed (together with the paint) into the bricks and
makes matters worse.

Is blue brick porous in this way or can I apply whatever I like with
confidence?

Conventional paint stripper is unlikely to be effective anyway for this
type of paint

I would have thought that blue brick is less porous than common brick -
ie, less of a problem here; but someone else may know better?

For a simple spray, try http://tinyurl.com/9rvcf (or
http://www.screwfix.com/app/sfd/sea/searchresults.jsp;jsessionid=4HPLX5TOBPMJXCJO2C4CI IQ?_dyncharset=UTF-8&q=13888&n=&pn=1&pd=1&pi=1&cn=1&cd=1&x=11&y=15 )
(have never used it myself so can't comment on efficacy).

If you're really desperate and are feeling flush, hire this kit!:
http://tinyurl.com/23se9 or
http://www.hss.com/Fae.asp?sysPage=w...sysLanguag e=[BASE]&resetToGroup=YES

David