Can someone recommend a reputable outfit that can clean an old VCR tape?  I am in the process of digitizing a number of old VCR tapes using the excellent Elgato Video Capture device. All tapes have worked OK so far but one won't play, and looks 'dirty'. I'd like to see if I can get it clean so I can record it.  There are a number of tutorials on the Internet but they look beyond me and I would prefer not to risk the tape with DIY cleaning!

Any good outfits - preferably in Wellington but anywhere in NZ would be OK?