The nice thing about a dirty low end bike is that you don't have to worry about getting it dirty... Yours may at least be straight gauge Tange tubing. And it's orange. I have the same bike (Carrera Sport) of roughly the same year and I never really rode it until I boxed most of the parts and put smaller wheels and fatter tires on it (and changed the fork, which is a biggie). Then I added the components that fit my needs for it. Thrashing it in the woods and on the pavement is a guiltless pleasure and this is my go-to bike much of the time for that reason. Enjoy it. It can be a very good bike, depending.