Hey guys, greetings from California. Can you check out this pic and let me know what you think and if you have any advice? I pretreated this huge concrete driveway with a hot 5% SH with my 12 volt (tons of mold and algae), surface cleaned, then I hit this terrible oil stain with purple degreaser twice, cleaned, and then about 10 hits and rinses of 50/50 muriatic acid with a poor result. I’ve used this same method on tough oils stains many times over the years with much better results. I really appreciate this forum and any ideas you might have including products. This customer of mine has a big propertiy mngmt company and gives me a lot of business. Thanks!
Hot water can help……I dont guarantee total removal of oil stains. Most will lighten to a shadow at best depending how long the oil has been there. You can only do so much……concrete is porous with layers down of oil, tough to get it out. Much success….you can use the f9 degreaser or gold assassin, pretty good stuff.
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Like @Kentucky1234 said, hot water and much better degreaser.
Muriatic acid? Never heard of that for oil. 50/50 sounds very strong.
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This is the after pic. I’ve used muriatic acid periodically as a last resort, you have to be so careful but it usually pulls a lot of oil and lightens up a lot of the stain when you simply spot treat it but not much this time. I’ve never used the expensive degreasers over the last few years I’ve been doing this but I’m ready to start. Ill check out some of these products. Also i plan to start bringing an old electric water boiling tea kettle thing i have, holds about 30 ounces and i can boil water with the 12v plug in the bed of my new Silverado truck and hopefully can just do that and move on. This business is awesome, not just the work but also a constant opportunity for leaning. Thanks for your replies…
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Good idea, imo. Noted. 
Simple solution for those of us that do not have hot water PWers.
Went back today for 30 min, scrubbed degreaser with a stiff broom and then tons of hot water and here’s the end result (wet and in the shade so maybe tough to tell) but it came out better and the customer was happy more so for my effort I suppose and maybe his mood. I forget that customers have bad days too. Also setting expectations with concrete, I’ll probably start showing customers before and after pics from previous jobs before I get started from now on to show a realistic outcome for oil and rust stains not sure why I hadn’t been doing that all along. Thanks for the great advice and support, I really appreciate it!
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