I suspect that when you cleaned the top of your plugs area you got some water in the plug wells...I've read the same symptoms from others who have cleaned that area. Give it a few hours (or use a shop vac and try to suck out anything in the plug wells) and try to crank the car again. Another thought is that you either pulled wires and broke them or the connections, or the plugs aren't gapped correctly. They should be at .028inches...tighten to 22lbs ft. Good luck

Btw, oil in that area is usually an indication that the PCV system is not functioning correctly and you are getting pressure blowing oil past the small hose that runs up to the top of the engine (from the oil separator under the intake manifold) and/or a bad gasket on your oil fill cap. Check it first and replace it...they tend to harden up, get brittle (from the heat) and not hold a seal after awhile.
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1998 S70 T5 Emarald Green Metallic (125K), 2004 V70 2.5T Ruby Red (45K), Previous Owner of Black '94 850 Turbo Wagon (Sold at 140K and miss her). My cars have been running so well lately they've got me worried.