When solving problems (math/computer science) I often scribble on some random sheets of paper to visualize my ideas or to save progress of some temporary solutions. I hate it, it’s a mess and a waste of paper. I’ve been thinking of getting something like a whiteboard for a while and I want to finally commit.

Does anybody have any recommendations for a whiteboard or a whiteboard-like (for example an interactive board) product? From experience I know that whiteboards get dirty quickly and require to be cleaned with alcohol regularly.

Alternatives I have considered and subsequently disregarded:

• blackboard (chalk dust in my room, no thanks)
• graphical tablet for my laptop (I want something that would always be on display, not hidden away in a file)
• tablet with a stylus (same as above)