The best way to clean a really dirty carpet is to rent/buy a carpet cleaner and clean it as many times as it takes to get it clean. Make sure you run the carpet cleaner without carpet cleaner a few times to rinse any residual soap/cleaner from your carpet. If doing this yourself is too much work you can hire a professional to come in and they will do it for you. It might be worth the cost to have it done once by a professional and then you can rent/buy a carpet cleaner to help keep it clean.
Every time I clean my mirrors, they end up having tons of streaks and almost look worse than before I started. What could I use to clean them that won't leave streaks...
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The best way to clean a really dirty carpet is to rent/buy a carpet cleaner and clean it as many times as it takes to get it clean. Make sure you run the carpet cleaner without carpet cleaner a few times to rinse any residual soap/cleaner from your carpet. If doing this yourself is too much work you can hire a professional to come in and they will do it for you. It might be worth the cost to have it done once by a professional and then you can rent/buy a carpet cleaner to help keep it clean.
I use a vinegar solution with a carpet cleaning machine I got at Ollie's for under $100.
This article might help you : https://www.apartmenttherapy.com/how-to-deep-clean-your-carpets-138567
For spot cleaning this stuff is amazing: https://amzn.to/2DvXMVr