Let's make a choice

On the left is a clean table, on the right is a dirty one. I made the dirt pretty subtle on purpose - otherwise it'd be way too obvious. That said, some players, especially on phones, might have trouble noticing it.

Here's how the table-cleaning mechanic works: once a table gets dirty, you can walk up to it even if nobody's sitting there. When Lona is next to a dirty table, an extra "Clean" button pops up next to the "Wait" button - using it cleans the table and costs 1 turn. You can clean a table even while customers are sitting at it.

So there are already a couple of extra cues telling you a table's dirty: the Clean button showing up, plus being able to walk up to a dirty table with no customers around.
So I wanted to get your take - should I add a little icon by the table to make dirty ones stand out more, or is what I described above enough?

I haven't actually made the icon above the table, but you can probably picture roughly what it'd look like (if we decide to add it with this poll).