The question really is whether this is OK for your carpet, and your machine? After all, both are quite expensive items in your home, and should be properly cared for.
To a certain extent detergent is detergent, and it will equally clean one type of fiber, carpet, as well as clothes.
However, you do need to consider the additional things added to laundry soap, such as optical brighteners and enzymes when making a decision of whether you'll use this on your carpet.
I don't inherently think there's anything wrong with using laundry detergent for this purpose, but if you're concerned always test in an inconspicuous area first because this is not a normal use for this type of product.
In addition, I definitely like Rick's suggestion of using HE detergent since it doesn't suds as much. I think this is important for making sure your machine is not harmed for excessive sudsing.
If you're looking for a carpet cleaning machine make sure to check out these home carpet cleaners reviews here on the site to find one that fits your home's needs and budget.
Do you use laundry detergent for shampooing your carpets? If so, I'd love to hear what type of detergent you use, how much you add to your machine, and any other tips and tricks you've learned from using this product in this way.
I hope you enjoy this gift, and stop by again soon!
CAUTION: This website is provided for informational purposes only. It is provided as is, without warranties or guarantees. Some stains and messes just won't come out, and are permanent. Further, some cleaning methods can harm your item, so if what you want to clean or launder is sentimental or expensive call a professional. See disclaimer of liability for more information.