Remote PC
I have a PC at my wash that I access from home. It *is* on the same dsl/network line with other equipment, and from home I can operate just like I was there at the wash. I'm not familiar with Washgear but I would think this should work with their equipment as well.
I use the "remote desktop" built into Windows. In my case, I'm using an older PC at the wash so it uses Microsoft XP. fyi you have to use XP professional (not home) for remote desktop. XP home doesn't support it.
Configure your PC at the wash to have a static (fixed) IP address. Something like 192.168.1.10 Then, log in to your router, go to the "routing" tab, and route port 3389 to the static IP address you just assigned to that PC. From then on, any incoming request on port 3389 will go directly to that PC. Oh, and the PC *must* require a password on startup. Remote desktop will not work unless the PC is password protected on startup.
That should be about it at the wash. From home, run the Windows Remote Desktop client (mine is in >accessories>communication) and make your connection. You will need to specify the IP address of the wash to connect. If you don't have a fixed IP at the wash (they are more expensive) you can use dynamic DNS (dyndns.org) but I always thought that was a hassle-- I just pay the $20/month for faster speed and a fixed IP.
If you have a smartphone you can also connect via your phone. On a Droid phone I use XtraLogic for a remote desktop-- and I can connect to the wash just fine.