Autosmart Tardis :)
Spray on and leave it for a couple minutes then gently lift any significat bits, wipe over with a soft microfibre cloth.
Be aware that whatever you use is likely to remove any polish on the car so ideally you will need to reapply some protection.
Good excuse to go over the whole car and remove any tar and other contamination before adding your chosen protection.
Also worth adding another step and removing any iron contamination with a product such as iron x. All depends how far you want to go.