The "oil effect" will remain, since the spray has to be washed out with water,
otherwise the stubble sticking and reduce the shave.
After cleaning, rinse with water so the shearing blade should be lightly oiled again.
I consider the product for not recommended, just under 7 euros for 100ml can create better.
A hot water jet cleans just as well when you clean regularly.
Also, there are large electric cleaner - spray bottles that are so good and gentle cleaning for sure, but cost only a fraction.
My recommendation: Stay away.