RE: 99 camry crankshaft/camshaft position codes
Was the oil was there before or after the valve gasket change, did the engine run OK after the belt change, does engine have remote cam and crank sensors mounted under timing cover or are one or both in the distributor?
The codes indicate the computer is not detecting a signal for the sensor(s). Could be a short or open in the wiring from the sensor to the computer, bad sensor(s), distributor issue.
Guessing the combination of degreaser and water got into the electrical connections and possible the distributor to cause problems.
You should disconnect the connectors and clean them with an electrical contact cleaner. These are the connectors at the distributor and sensors (if not installed in the distributor). Also remove the cap to make sure water did not get inside the housing.
The sensor wires Black/White, Blue, Brown, Brown/Red.