I got my car in the same condition you described. Mine was sitting in a storage lot for a while and I actually took it back the next day and had them clean it again.
Welcome! Another Portlander! I also got my Mirage recently for about the same price. Got ours from Alan Webb in Vancouver.
I've attempted to buy cars from Gladstone, but it's always rubbed me the wrong way. Even when looking for a Mirage a few weeks ago, they were overly pushy.