Steam is a one of the most effective methods for when attempting to remove carpet indentations, and is worth a try if the ice cube method fails. Turn of your iron and get it hot. Holding the iron a few inches above the carpet fire a shot of hot steam directly at the carpet beneath using the steam button. Be careful not to scorch the carpet by not making direct contact.
The steam should penetrate the carpet fibres. Please look to see if the carpet spring back to its original shape. Continue this method until you see the spring return and potentially use some suitable object to encourage the spring back.
Another technique is to place a damp white cloth over the stained area and use the steam method once again. The cloth acts as a barrier between the carpet tile and the floor, ensuring you will not burn your carpet.
Another method that is a tad risky is to run the hot iron over the cloth whilst simultaneously firing steam into the carpet. This had to be done with caution though as holding the iron in one place for too long could melting the carpet pile, leaving it ruined.
Placing ice cube onto the indentation allow it to slowly melt for a few minutes. When the ice cube turns into a liquid, the carpet has then absorbed the once ice cube and hopefully your carpet will then fluff up. To add additional moisture you could use a spray bottle or similar. Then its time to wait, minimally 12 hours before blotting any excess moisture.
When the spot eventually dries, hopefully you should see less of an indentation. Use a hair brush or similar type object to can aerate the pile. One of the most effective tools is a pile grooming brush, many carpet stores keep them in stock. Repeat the process as many times as is necessary until the indentation has disappeared.
A hair blow-dryer works well too. Simply warm the carpet pile up using the blow-dryer and plump using a suitable tool.
Best practise is to use a spot to test somewhere out the way and not noticeable if things go a bit wrong. Exercise caution!
For other, more delicate carpets such as antique ones trad with caution as you may accidentally ruin that expensive rug.
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