your nail, very softly. idk I dont have a stylus

Clearly, your tongue. A screen protector is always a good idea too. Always remember to use protection!

Try using a cheeto!

Eraser on a pencil works alright if the rubber is decently firm

a q-tip (typing this w one)

finger

use your 3DS stylus if you have one or try sticking a hold neddle in a qtip then use the little ball on the other side!

steal a wii u stylus