Martin
Petrol would remove the oil based stains but just like Chlorine based bleaches it also attacks the stability of the cotton structure.
Posting photos is fairly easy
Just start at top of this page in the dark blue line where it says Albums,
You will then be asked if you want to add photos, click on add photos and you will be asked to create an album.
Fill in the Album title (with or without more info) then click on create the album.
You will then find yourself on a page where you select photos from your computer and upload them to the forum.
Check that the uploads are the correct ones and confirm changes.
Your new album is now created and populated with photos.
To add the photos in to a thread simply click on the little black camera that lurks at the top of each thread posting page.
Then just select the photo that you want.
Sounds easy but it took me a while to fathom it out.
Paul