This would depend on if it's fresh or not. If it's been sitting in the carpet for hours, than I'd get a rental shampooer or a wet/dry vaccumn with a longer type of hose and flat / wide nozzle, wet hit first , than start to bring it up.
If it's just spilled recently and is still wet, not too sticky, just get a plastic gallon milk jug, get a pair of scissors or a straight edged razor cutter and slice the whole jug in half, and use as a scooper. put the contents of dish soap into a bag and toss it.... it's not good.
at 7:40 PM on Oct. 9, 2010