One simple solution to removing tar stains from carpet is to saturate a cotton rag with water and dry cleaning solvent then blot at the affected area.
Black sticky spots on carpet.
This causes over 97 of recurring spots.
Clean them and during the drying process the spot wicks up again but into a larger spot.
Choose products specifically created for lifting sticky stains from carpet.
The moisture from the water and dry cleaning solvent should help lift the tar from the carpet fibers.
Wet a cotton towel with plain cold water wring it out and wipe the stain with wide sweeping strokes.
The sticky residue attracts dust and other dirt particles appearing in the form of black marks on the carpet.
However if the stain has set in you may have to repeat the process several times before you notice that the stain is fading.
Sometimes just starts as one yarn strand of a tuft.
Discolored patches may start with various shades of green or black caused by the mold colony in large number.
Start as a small dark pencil eraser sized dot in the carpet.
Look for products with ethanol alcohol to remove stubborn stains.
Mix the cleaning product of your choice with water per the product instructions in a bucket.
A partial list of substances that attract dirt are.
You can purchase these products at discount department and home improvement stores.
Sugar oil detergent grease adhesive residue such as after removing tape soft drinks urine ice melt and butter.
Whilst drying cover the spot with a moist cotton towel.
Sticky spots something that attracts dirt got on the carpet.