DIYbanter - dirt/grease on good clothes

"john brook" wrote in
:

Got some black dirt/grease off the car, on to my good trousers. The
usual trick which solves it, is to work in some Swarfega hand cleaner;
and then detergent and warm water washes it away.

My problem is that being in a hurry i did not work the Swarfega in
deep enough or well enough, and then went on to wash it.

So its now 'set' into the trousers. Grateful for any further
suggestions.

Seagull ****. Removes anything from anything.