I've used TWG before for my USB Retrofit and Alpine Retrofit, top indy garage, Will is very knowledgable and helpful.
I've also had a service from them and introduced a couple of friends, all are happy...
I've recommended them on here before, good to see others are as well, reasonable prices and their workshop is in a industrial estate which has ample parking and overnight facilities, here's the website link:
http://www.twgautomotive.co.uk/about.php
I'm actually seeing Will next Friday, I will ask him what machines they use for this valve cleaning..
Regards,
Tich.
