SOAPBAR (it's called "soap" because a 250g bar is shaped like a bar of soap) is perhaps the most common type of hash in the UK and it is often the most polluted.

Now, not all soap is bad of course, but some certainly is. At worst there may only be a tiny amount of low grade hash mixed with some very strange stuff:

Beeswax, turpentine, milk powder, ketamine, boot polish, henna, pine resin, aspirin, animal turds, ground coffee, barbiturates, glues and dyes plus carcinogenic solvents such as Toluene and Benzene