It's fairly common here in the UK and on amazon, but might be harder to find in other countries.
Get a neaded eraser. It’s sticky and the shavings will stick to it. Warm the eraser by neading in your hands like you word if it were gum. Sticks like gum. There is also blu tack. Art store may have here’s link. Blu Tack Handy https://www.amazon.com/dp/B0001OZI70/ref=cm_sw_r_cp_api_i_IRuvFb3CPZQRY
Neaded erasers.
Large Kneaded Eraser (2 Eraser Pack) https://www.amazon.com/dp/B012561WIA/ref=cm_sw_r_cp_api_i_aTuvFbPZ3TPXR
It might have another name but it's that putty thing that you use to stick posters and stuff to walls. It should be easy enough to find. Here's a link on amazon https://www.amazon.co.uk/dp/B0001OZI70/ref=cm_sw_r_sms_apa_vq56xbCKKGW0A