Mice v Beans

Can anyone explain how the parrafin or any other deterent works for beans versus mice as we have lost the second 2 rows to these pests ,they eat the actual seeds in the ground, I was told an old remedy was parrifin ,if so how long does one soak them for please,many thanks Alan/Kate 

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It's not something I'd do now.
I sow mine in pots and when they're big enough I plant them out - then it's just pigeons and slugs to worry about
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
The only direct sown remedy I've tried that worked was my grandfather's trick of sowing peas and then laying pieces of gorse on top of them before covering them over. I don't have a handy gorse bush here but it did work the one year I tried it.