Brake parts cleaner is your friend. It’s only a couple of dollars for an aerosol can, you’ll need 1 or 2.
Raise and block (jack stand) the car or drive it onto ramps if you have. Get a large drain pan or large/thick piece of card board and slide it under the car in the area of the leak.
Spray the affected area with the brake parts cleaner (Neoprene gloves, face shield or goggles at least). The brake parts cleaner will ‘cut’ the oil and wash it off of the parts. It is VERY thin fluid, so be prepared – wear old clothes. No need to be concerned overly about spraying hot parts (it is flammable, but will need a naked flame or spark to ignite), just try to avoid rubber parts as best you can (serpentine belt). Spray from the sop down for greatest effect, use compressed air nozzle to ‘chase’ the brake parts cleaner if you have access.
Get it as clean as you can, it need not be perfect but as best as you can. Be sure all of the brake clean has evaporated or you’ve blown it dry with compressed air.
Start the car and observe, try to spot the leak at it’s highest point, that’ll be the source – possibly the crank sensor itself or that black box on the side of the block? Don’t rev the engine up while you’re observing for the leak, windage from the accessory drive pulleys will push the leak all over the engine, confusing the issue.