Top grade hash is just pressed trichomes(resin) then you've got lower grades that are contaminated with some amount of plant material and then you've got soapbar/fake squidgy which is contaminated with all sorts, plastic, henna, coffee, oil you name it.
Soapbar really ruined the hash scene in the UK a whole generation grew up with that being pretty much the only solid on offer so folks opinion of hash in general is pretty low still even though there's some great stuff about now.