These 8 applications are represented graphically with the help of icons.

I solved the problem of limescale (represented with dots around the icons) with the most iconic symbol of cleanliness and shininess.
I think I delivered the 3 steps/points, that needed to be illustrated: the problem > the product that was used > the result.

I opted for a simple design for the icons, which can variate depending on the background (it can be done in white or a darker color). I chose a dark blue - # 052535 - to be warmer and friendlier (I don't believe in the power of black; sometimes it can be too much).