Budget and mid range phones often use denser mesh, which traps more fine dust over time.
Android hardware variation
Speaker placement, mesh density and amplifier headroom vary widely between makers, so the same tone clears one phone faster than another.
Using vibration as well
Android browsers can drive the vibration motor, so the combined deep clean mode is genuinely stronger here than on an iPhone.
Try the free speaker cleaning tool and measure the result before and after.