Forum adverts like this one are shown to any user who is not logged in. Join us by filling out a tiny 3 field form and you will get your own, free, dakka user account which gives a good range of benefits to you: No adverts like this in the forums anymore. Times and dates in your local timezone. Full tracking of what you have read so you can skip to your first unread post, easily see what has changed since you last logged in, and easily see what is new at a glance. Email notifications for threads you want to watch closely. Being a part of the oldest wargaming community on the net. If you are already a member then feel free to login now.

You can use white spirit or an enamel thinner. Usually I go for the enamel thinner made by the company that made the enamel since there are slight differences in the composition (so use Testors thinner for Testors paints and Humbrol thinner for Humbrol paints). MIG make their own enamel thinner as well but I personally haven't tried it.

MIG actually make a thinner specifically for washes but again I haven't tried it:

http://www.bnamodelworld.com/mig-productions-mig-p239-thinner-for-washes-use-with-oils-or-enamel-paints-75ml

You can probably get away just using white spirit though.