It's all in the preparation! I'd suggest using a pressure washer sand blaster like this https://www.amazon.com/Selkie-Pressure-Washer-Sandblasting-Kit/dp/B086W4TNQC/ref=sr_1_3?keywords=pressure%2Bwasher%2Bsandblasting%2Bkit&qid=1674821107&sr=8-3&th=1
A few bags of play sand from Home Depot...