A true effective slope to the drain could be a wonderful thing if indeed you do plan to do a lot of car washing, wet sanding, whatever. But like others have said, if it is not what you wanted and you plan to be in the shop a lot...
Every fire station I've ever worked at has pitched floors and at least four large drains... the low spot in the floor is never at the drain. It's always a foot away and you end up pushing water up into the drain. When I had my shop done, like you, I wanted a place to wash my car inside during nasty weather. I asked the concrete contractor if they could simply trowel an area about 20x20 to pitch down an inch or so into a drain. They tried and damned if it isn't just like the fire station, the low spot is a foot away from the drain!
Jeff-
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You remind me of the timing on a turbo engine...
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