Our living room carpet is generally clean and well-hoovered, but it has little patches of dirt all over it that don't come up. I think they're caused by DS spilling something slightly sticky, which then attracts dirt to that spot.
What's the best way to deal with them? Some kind of carpet cleaner, scrubbing with a brush, any special cleaning solution? Never had to clean bits like that before as didn't spill anything sticky before DS came along?