Does anyone have a positive experience in removing OLD oil stain from concrete?

I had a massive old oil spot on my concrete. Thought I just had to pour it on and watch the magic. Nope, you have to pour it on (I didn't dilute it), then scrub it for a minute or two, then rinse it off with the hose. Did that a couple times because the oil seeps back from underneath, and we are good! If this isn't working for you, try again, but make sure to spray it off with the hose!

How can i used this product in car engine? What step should i follow?

Engine has to be cool. Cover any or all electrical components that will get damaged with water. Spray Oil Eaters and let it soak all the gunk. Works best when used with pressure washer. Do not spray straight to electrical distribution boxes or Fuse boxes. On some newer car you can get away with not covering ay electrical harness or components. On older cars you may want to use precaution measures and cover these items with zip lock bags trash bags,etc. After rinse let the warmth of the car dry the excess water for about 5-10 minutes. Remove all covers. Start you car and let it run on idle these way your car can generate heat and dry any remaining water. If you engine begins to run rough you might have moisture or water in you electrical harness,distributor,coil packs or spark plug and wires. Best if you disconnect the wire harness/plugs one by one and inspect for water intrusion or moisture build up. Once you locate the issue let it air dry or spray with compressed air. If you do not have a compressor and air gun available, a computer aeresol spray will do. I used isopropyl alcohol in the past, but alcohol will remove the corrosion preventive coat. Petroleum Jelly like Vaseline can be applied. Auto part store have a variety of electrical grease you can get. Ensure that you induction system is air tight. If equipped with carburator, make sure that the dish is seal and as a prevention spray around the carburator and its components. Key points, cover electrical components, spray away from electrical distribution boxes,fuse box and other electrical components. And ensure your induction system is sealed. There is some prep work that has to be done before you spray you engine with any liquids. Oil Eaters will do your dirty work. Rinse at your own discretion.

ASIN	B000EALHHG
Best Sellers Rank	#60,198 in Health ( See Top 100 in Health ) #960 in All-Purpose Household Cleaners
Brand	Oil Eater
Brand Name	Oil Eater
Cleaning Agent Formulation	Degreaser
Contains Liquid Contents?	Yes
Customer Reviews	4.3 out of 5 stars 10,556 Reviews
Global Trade Identification Number	00027427354370
Included Components	Unit^Instruction Guide
Item Form	Liquid
Item Type Name	Automotive Accessories
Item Volume	1 Gallons
Item Weight	3.86 kg
Item form	Liquid
Item volume	1 Gallons
Manufacturer	Kafko International, LTD
Material Features	Biodegradable
Material Type Free	Noncorrosive, Biodegradable Formula
Material features	Biodegradable
Number of Items	1
Scent	Fresh Lemon
Special Features	Concentrated, Non Abrasive
Special Ingredients	Grease-Cutting Agents
Specific Uses For Product	Floor
Specific uses for product	Floor
Surface Recommendation	Concrete, Wood, Laminate, Fabric
UPC	027427351379 027427354370 848238040272
Unit Count	3780 Milliliters

Oil Eater Original 1 Gallon Cleaner, Degreaser - Dissolve Grease Oil and Heavy-Duty Stains – Professional Strength

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