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I agree with kenkart above, and would refine my suggestion to one of the older all-metal Electrolux polishers.
The later plastic-housing machines are not heavy enough to thoroughly do the job. These machines were sold mainly as rug shampooers with floor polishing a secondary duty ....... which is kinda odd since originally it was the other way 'round -- they were primarily floor polishers with optional rug shampooing equipment. So they were made lighter to be easier to push them across carpeting.
You'd want to find a Model B8 - Over the years the B8 was done up in light turquoise, dark turquoise, gold, dark brown, and metallic gray.
Here are some photos of my favorite version in light turquoise. Check out that snazzy mid-century starburst motif on the rug shampoo tank!
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