Lexus GS 2013+ :: Check Park Sonar System Error Message

So with all of the snow we've been having in the north east this is usually an error message I get almost every week. Normally this is due to the front sonar sensors being covered in ice or snow and will go away once it melts when I'm parked in the garage or is washed off.

However the past few days, I've had the car washed a few times to make sure the salt is off of the sonar on the front bumper but I'm still getting the error message stating to check the front sonar. If I leave the park assist on it works for the sides but not the front and the error message still stays on the screen. I've hand-washed the sonar sensors several times and 'massaged' them in place to maybe break up some ice behind the bumper or get the sensor to work but I've gotten nothing. Upon further inspection, one of the sensors has a deep scratch in it to where you can see past the paint of the car slightly.

I'm really not looking forward to taking the car to the dealer to have them look at the sensor because they will most likely charge me a ton. I saw a few other posts on the forums about the LS400 from '99-'00 having a similar issue and it cost them $550 to get it fixed. Obviously it's not the same car but I'm expecting a similar quote. I'm assuming the paint scratch is what is causing the issue as another post for the LS mentioned the same thing and said they had to scratch all the paint off of the sensor to make it work again.