Will this work with a iPhone 15 Pro Max with a case and pop socket on it?

The cell phone holder is suitable for all cell phone devices which are between 0.23-0.47inch thickness.If you need more room, you can try to move the detachable back cushion, and then it can make the slot bigger and more angled how it needed to be.

How much space does it need? Does it stick to the surface of car?

It needs a flat smooth surface (5 x 5.1 inches) for installation. Applies to the most majority of dashboards, except some slightly texture surface or inclined, curve, irregular shapes.

Can I easy to move and wash it if it gets dirty?

This car mount is washable and reusable. You can peel off the holder from the bottom layer of the base. If the car mount is dirty or it cannot stick well, you can wash the bottom and it will be sticky again.

Does the sticky tape leave residue when removed?

The bottom adhesive of the dashboard car phone holder is not a permanent tape. It can be easily relocated without any marks if needed.

How should I install the car phone holder?

1.Wipe up the dashboard

2.Peel off the protective film

3.Stick & compact the car phone holder

4.Fix/ Take off the phone with one hand