Me too!
One easy way is to tackle stubborn carpet spots and all over cleaning with a home made solution of laundry detergent and water.
For spot removal, mix a tablespoon of eco-friendly detergent with a cup of warm water. Use a fingernail brush or stiff sponge to first dab in your cleaning solution then scrub, scrub.
Mop up excess moisture with your sponge or dishtowel. Comb your fingers through the carpet to get the fibers back up and into shape. Let dry for a few hours et voila! Feel free to comb fingers through at any point in the drying process to give yourself piece of mind that the carpet will come out looking like new.
As always, when trying something for the first time, do a little spot test to confirm it's the best solution for your carpet.
Good luck!