Yes do tell I need to clean my toddlers
I used a foam carpet stain remover & sanitiser that’s safe for kids, sprayed it down and let it sit (you could literally see some of the dirt, food and marker come up when it foamed), scrubbed smaller sections/stubborn spots with a toothbrush, the rest with a soft mesh scrubber, used a warm damp cloth to wipe over when I was done and then let it completely dry out. Honestly probably took like 30-45mins to clean it up properly - including vacuuming crumbs, the straps, underneath and the actual outer shell/hard plastic parts
Read your manual. Most seats don't allow for harsh chemicals to be used to clean. Most only allow for gentle soap/detergent and water
How did you clean it ? My toddler's seat gets like this sometimes and it's really hard to get the stains off 🫠 x