Wow, you guys are fast! Thanks! Ken, if I use Roundup on the ajuga, will I be able to plant anything else in those spots once it's gone? Or would that make the ground too toxic for other plants? Thanks!

I think it's similar to Cedar-Apple rust, so if anyone has had any experience with that, I would like some advice on how to proceed next year. I don't want to take out the tree if I don't have to since it is an established planting.

The very best thing that I have found is a really cheap toilet bowl cleaner I've only seen at Walmart. Its called "The Works." When we moved into our lake cabin, all the fixtures had rust stains. Using this cleaner and a long handled toilet bowl scrubber ( the kind that has a scrubbie pad) over a period of a couple weeks I was able to remove every bit of the rust stain. It will slowly dissolve the stain and make it smaller as you repeatedly use it. I think I probably used it every other day and left it in the bowl for about fifteen minutes after I squirted "The Works" around the rim and bowl sides. Do keep your ventilation on as this can have an overpowering odor.

In my former home I had about 600sf of 4" tile with discolored sahara beige grout. It was recessed among a thousand squares of sharp edged unglazed quarry tile. MILES of grout! No surface cleaning machine will scrub the grout if it is recessed and the scrub pads will clean the tile and float there. I talked to equipment rental places regarding disc floor machines with pads and brushes and was told it really wouldn't make great contact down there. I manually tried many chemicals, stopping short of carcinogens. I used stuff that should not be used on grout including oven cleaner and the most effective was Lysol 10x toilet cleaner in the black bottle. I had an industrial strength steamer that cleaned but didn't remove discoloration. In the end, the toilet cleaner and a battery powered brush like this at Amazon was what worked the best. It was tedious and messy and I used dozens of rags to wipe up and rinse, doing this over a long period of time. It never looked like new and despite being "clean", it was not uniform in color. I was a tough critic, though, and it was probably fine for most people. Of course I sealed it afterward. If you choose to hire someone, ask if they will do a sample section so you can determine if it will clean to a uniform color. Instead of the painted on stuff that will not last (and looks like paint IMO), I wonder if there is a stain like product that would darken porous grout. Good luck with this.