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We have outdoor carpet on my covered patio that we want to remove. The problem is that the glue holding the carpet down is orange and very ugly.

ow can I remove this glue safely without injuring my animals (cats, dogs, desert tortoise).

I have a 2700 PSI pressure washer, will that do it? If not, what should I use to remove the glue so we can expose the concrete?

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What is the next finish to be ? Paint, bare? Removal somewhat depends on the final result. Reciprocating saw scraper blades are a good first step, before power washing. – HerrBag Dec 24 '13 at 20:49
As somebody who went through this exact same project a few years ago I can say with assurance that there is NO EASY WAY TO DO THIS! With that being said, in hindsight, liberal use of a grinding tool to chip away at the surface of the concrete is probably the quickest way, but then you will need to repair the surface of the concrete when you are done. Trust me, thinners, chemicals and wire brushes in 100F summer heat was a painful choice. – maple_shaft Dec 26 '13 at 13:03
@maple_shaft - I share the same problem- 100F+ temps in PHX, AZ USA during the summer months. – Donn Felker Dec 27 '13 at 15:53
@HerrBag Thats a good question and unfortunately I don't have a great answer to. All we know is we want this horrid carpet gone. Bare concrete would be much better, but we may decide to just put down some simple, easy to powerwash/replace rugs to make it a little nicer. Not sure yet. – Donn Felker Dec 27 '13 at 15:55

Simple floor scrapers like this one, pictured below have always done the job for me - they will take pretty much anything off a flat surface including splashed concrete.

enter image description here

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Nobody can really tell for sure what will work but you - we haven't got your particular glue handy to test.

Pressure washer is a good bet. You have it, so try it. If at first it doesn't succeed, try a narrower nozzle.

A wire brush might also work. If the glue is brittle, a silicon carbide grinding block may work - or you might rent a terrazzo-grinding machine at a tool rental store for a more industrial approach to grinding it clean, especially if it's a large area.

Muriatic Acid probably scares you as terrible for you and pets, but if you keep the pets off while using it, dress properly, and rinse throughly and then spray water and baking soda mixture around (not actually required, but worth it if it gives you peace of mind) it can be safe and effective at cleaning up concrete.

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Depending on the condition of the cement surface, you may find that the pressure needed for the pressure washer to dislodge the glue is enough to cause flaking of the concrete surface. Grinding it off might be safer. – Johnny Dec 24 '13 at 22:02
Many glues that appear brittle upon initial inspection and susceptible to grinding away will heat up during the process and turn into a gooey mess that clogs up sanding/grinding media. Guess how I learned this :( – bcworkz Dec 25 '13 at 0:40

Removing outdoor glue is the bane of my existence. Chip the worst of it off with a sharp bladed scraper (Roberts 9" long handled scraper works for me).

Use chemicals to remove as much of it as possible. Chemical choice will change depending on the glue; if you don't know what type of glue your going to have to experiment.

Use an orbital sander. Start with the heaviest grit possable ( 24 grit is a good starting point) and work your way down to an 80 grit. Any more than that is kind of pointless unless you have a lot of time and sandpaper.

Burnishing or polishing will result in a nice finish for the concrete.

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