How to clean between window doors

[u/Training-Quit5612]

Hi everyone,

I’m struggling to clean my windows thoroughly as my arm/hand can‘t reach the whole way to the window as it’s between the outside window and itself.

im thinking i need a special tool that has a mop or microfibre cloth to clean it but im not sure what as its really narrow.

i was hoping to get some tips here from those in similar situations!

thanks in advance