I have. A2004 ford focus and I was wondering if there should be oily water in the engine under the spark plugs?

Sounds like either the rocker cover gasket is leaking or people filling up oil and spilling it , it will run down in to the plugs . If it is the gasket usually the walls in the recess where the spark plugs are is wet with fresh oil. the water is a mixture or rain water and screen wash. I've known people to make a plastic cover to sit on top of engine to prevent this.

Well the easy answer is no. However I have used cars with mucky engines for years in the past. This could be a simple leak of oil or that's mixing with rain water or it could be a sign of the start of cylinder head gasket failure.

Absolutely no,please check your coolant bottle and make sure it has antifreeze in green/yellow so we know that you are not leaking it into the engine if the liquid is antifreeze is it in all cylinders or just one ? Or is it water? This needs to be done today and if it's water and your coolant bottle is filled with antifreeze then we can rule out a leak from your engine and look for missing fender splash guards/ or broken wiper cowl by the windshield or a missing lower engine cover water can be getting in from carwashes/rain so you have to do a little looking around or get someone to help you ////either way your engine should be misfiring running rough and check engine light is on ////when you say oily water do you mean just water with a slick on it(outside water getting in) sort of how salad dressing looks or is it a mustard looking color?(engine leaking antifreeze)if it's just a slick get someone to pull the spark plugs use a sweat sick and a long screw driver to clean the plug Chambers where the plug screws in use carb/fuel injection cleaner on all wet cylinders and leave the plugs out so it can dry up inside the cylinders for about 2hours the cleaner will mix with and help dry up the water examine the spark plugs and the wires boots or coil on plug boots to make sure they are not burned through and dry if burned replace them after this process is complete start the engine and observe the running condition for about a half hour if no water is present then we know it's coming from rain,carwashes and something is missing letting the water in go to rock auto.com and look up your car (body section inner fender splash shields)(engine section cover)for pictures so you can see what your looking for if you are running your engine with water and you find water after cleaning depending on what cylinders it's in possible cracked head///blown out head gasket if the water is in the combustion Chambers under the plugs but not on top where the plugs screw in ///either a cracked block or head gasket is the car steaming smoke from the exhaust if so then big problems if not the you are still leaking water into the system a loose hose clamp bad thermostat gasket or a broken hose or pipe leading to the heater core please write done everything you have done for me and post back with precise info and I will do the best I can to help you obviously I'm not there so you have to think carefully about what you say in your post do not be vague because we will never be able to get to the problems cause good luck Stephen