Ah, the suede leather sofa: the supermodel of couches. It's gorgeous, luxurious, and unfortunately, has a bit of a dramatic reaction to things like red wine and greasy popcorn. You've come to the right place for advice, though I must say the digital breadcrumbs you provided were a bit sparse. One link was to a general YouTube page that offered no cleaning wisdom whatsoever, so we'll have to rely on good old-fashioned expertise.
First things first, for day-to-day upkeep and light dust, your best friends are a suede brush and a vacuum. Think of the brush as a spa treatment for the nap, fluffing it up and keeping it looking plush. A gentle pass with your vacuum's brush attachment will evict any crumbs that have taken up residence. Do this regularly, and your sofa will look less like a neglected pet and more like the chic centerpiece it's meant to be.
Now, for the inevitable spill. When a liquid disaster strikes, your mantra is "blot, don't rub!" Grab a clean, dry cloth and press gently to absorb as much as you can. Rubbing will only push the stain deeper into the suede's delicate psyche, and nobody wants that. For older, dried-on stains, you can try a suede eraser (or even a clean pencil eraser in a pinch) to gently persuade the mark to leave. For oily or greasy spots, sprinkle a little cornstarch on the area, let it sit for a few hours to work its absorbent magic, and then brush it away.
If you're dealing with a truly stubborn stain that scoffs at erasers and cornstarch, it's time to bring in the big guns, albeit cautiously. You can use a small amount of white vinegar or rubbing alcohol on a clean cloth. The key is to test it on a hidden spot first to ensure it doesn't discolor your fabric. Dab the stain lightly, don't saturate it. Let the area dry completely, which happens quickly with alcohol, and then gently brush the nap to restore its texture. With a little consistent care, your high-maintenance suede sofa can be surprisingly forgiving.
