One of the reasons I stopped using Squadron Putty and switched to water-based products is because once applied to the model it cannot be cleaned up without damaging the model (or sanding, which also damages the model).
The other reason is Squadron dries inside the tube and now I have 4 or 5 tubes of rock-hard putty in the house, completely useless.
Or am I missing something? Is there a thinner that will wipe Squadron Putty clean without melting the model underneath?