Hopefully someone more knowledgeable than I will reply, but it seems to me you should be able to just flush it out with lots of water. After all, we do dump the acid in our pools without any problem, right?

philanna,
Actually, cannonball is right. Flush and then use a neutralizer. I spilled an acid based tile cleaner in my tool box and it started rusting quickly. I finally removed the box, cleaned it out and repainted the interior.
It was a mess. Good luck.

I remember when pebble tec acid washed our pool, they neutralized the acid so they could drain it into the storm drain....I guess you are not suppose to put those types of chemicals (especially full strength) down the storm drain.