Concrete Stain - Options?

[etrain16]

Due to two back to back years of rotting pumpkins on the porch, I've got some stains that won't come up. I've tried CLR, bleach and a few other things to no avail. Any options to clean this, or is this just a permanent decoration on my porch?

The stain in question:

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[jbett98]

Muiratic Acid and a stiff plastic bristle brush.
Don't wear good clothes, have a hose ready to flush it off the concrete and for sure safety glasses and rubber gloves.


Klean-Strip
1 gal. Green Muriatic Acid

Etches concrete

• Brightens concrete and masonry
• 90% lower fumes than standard Muriatic Acid

$7.84 /each

 

[moose]

This should be merged with that explosives thread. You could kill a lot of birds with that, given the proper amount of explosive motivation.

 

[mkwerx]

And after you get the stain gone - next years punkins are going to sit on a nice little wooden stand, right?

The muriatic acid should do the trick. Beware that it will eat a thin layer off the concrete though, its how it works. And maybe degrease the spot first with dishsoap if theres any oils present, for best results.

 

[Ramjet12]

3000 PSI pressure washer with a rotary nozzle.

 

[etrain16]

Muiratic Acid and a stiff plastic bristle brush.
Don't wear good clothes, have a hose ready to flush it off the concrete and for sure safety glasses and rubber gloves.


Klean-Strip
1 gal. Green Muriatic Acid

Etches concrete

• Brightens concrete and masonry
• 90% lower fumes than standard Muriatic Acid

$7.84 /each

I'll look into that, thanks for the recommendation.

 

[etrain16]

And after you get the stain gone - next years punkins are going to sit on a nice little wooden stand, right?

The muriatic acid should do the trick. Beware that it will eat a thin layer off the concrete though, its how it works. And maybe degrease the spot first with dishsoap if theres any oils present, for best results.

You'd have thought I would have learned my lesson the first time. Nope Third time's a charm, right?

I'll keep the degreasing in mind as well, good idea.

 

[etrain16]

3000 PSI pressure washer with a rotary nozzle.

I do have an electric pressure washer, which I tried last year, didn't pull it up - but it's not a 3,000 PSI model either.

 

[Joe13]

Cover it with baking soda and drip some vinegar on it.

Scrub, rinse and repeat.

You'll be suprized most likely.

 

[v0lcom13sn0w]

3000 PSI pressure washer with a rotary nozzle.

thats bada&$

 

[Stomper]

thats bada&$

Removes body hair, too! (Bone deep that is)

 

[Joe13]

I do have an electric pressure washer, which I tried last year, didn't pull it up - but it's not a 3,000 PSI model either.

You can do that with newer concrete but try that with older stuff and you'll just rip ridges into it.

 

[etrain16]

Removes body hair, too! (Bone deep that is)

Well, it would beat hot waxing my special places

 

[Joe13]

 

[v0lcom13sn0w]

 

[Oregonhunter5]

This is one of those threads where a guy can brag. My father in law has worked at landa for 40 years. Lol!!! Yes sir. I get the finvest machines. Hot water machine is next.

 

[deadeye]

I'll look into that, thanks for the recommendation.

Make sure you have pure white vinegar ready in case you get it on you to use as a neutralizer and DO NOT mix water into it but rather put into water ( acts like hot grease if water is added into it). I use to use this a lot when I power washed for a job. You may just go to Home Depot and get what they sell for driveway cleaning as it isn't as strong. Good muriatic acid should smoke when you open the jug and make sure you have good ventilation. A high concentration of sulfuric acid would also work just make sure you wear good rubber gloves, preferably goggles and rain gear with a no wind day also for either acid.

 

[308]

When my dad was a detective he said Coke was good for cleaning blood stains off the street/sidewalk/garage floors

Maybe it will work for pumpkin too

 

[Joe13]

Make sure you have pure white vinegar ready in case you get it on you to use as a neutralizer and DO NOT mix water into it but rather put into water ( acts like hot grease if water is added into it). I use to use this a lot when I power washed for a job. You may just go to Home Depot and get what they sell for driveway cleaning as it isn't as strong. Good muriatic acid should smoke when you open the jug and make sure you have good ventilation. A high concentration of sulfuric acid would also work just make sure you wear good rubber gloves, preferably goggles and rain gear with a no wind day also for either acid.

Yea, acid is no joke.


I thought vinegar was an acid, not a base?

 

[Certaindeaf]

Oxalic acid crystals in solution and then apply a/the neutralizer. They sell it in all paint stores and whatnot.