just use a hair jell spray... it's the same thing.
or wax ur lisence plate couple of times... it works that way too.
car polish compound works also...
well basically, anything that makes ur car shine will do the trick
there's many ways that you can do to make the lisence plate invisible to the cameras with flash light without spending extra money. (hence, using what you already have in ur house.)
just a heads up for ppl dont want to spend extra money.