I just had my washer-dryer repaired by CandyHoover. They replaced the tub and drum. I put it thr...

Candy CMD 146 washer dryer. I just had my washer-dryer repaired by CandyHoover. They replaced the tub and drum. I put it through the half hour cycle yesterday, then today I put a couple pairs of jeans in it on the 40C cotton cycle. When they came out they looked like I had been wearing them in the mud. They were streaked with gunge basically - I guess this happened throught the 'replacements' being fitted. Anyone know what I should do to get rid of this? Someone suggested bleach, but I don't know whether this is a good idea. Any suggestions welcome.