It's very easy to remove the top layer of grout in most installations with an oscillating tool fitted with a carbide grout removal blade.

The upside to the purchases is that the warranties on both vehicles cover ALL OF THE MAINTENANCE down to bulbs and wiper blades all I have to do is gas em and go 

In in real life it's a numbers game...you just need to keep weeding through them until you find your blade of grass so to speak.Good Luck!

Most electrical appliances have a dedicated neutral plug today (the big blade on the plug), and the ground wire and the neutral wire in an electrical panel are connected anyway (you can take the cover off and see how they are connected).

Also with it being next to the houses for so long it's probably loaded with nails and other foreign objects which tear up blades....

I also have a box blade attachment. 

It also eats jigsaw blades and most of the cuts I made with the jigsaw were with all teeth gone, the blade was essentially a knife (still worked).

Look at the top photo then the bottom... now think (Is that worth 587$ plus an afternoon and a rather dull miter saw blade?) 

I like to use a Sonicrafter vibrating tool to make precision cuts in drywall (my favorite tool - tool is cheap, blades are expensive). 

They used to have a machine that was like and plainer with a spinning drum blade on the bottom that you pushed along and it would literally shave off the first layer of the floor.