I have no symptoms but was near someone who tested positive. Can we beat the test by wiping alcohol inside our noses?

I dont trust the results , i have read plenty about PCR tests being unreliable Covid not being isolated and also people who cancelled their tests and were notified later that they were positive. So we are screwed?? Work requires the test, need my job , so there is that. My concern is that its all just a crap shoot, a spin the wheel algorithm that will determine if i can go back to work or not. THIS SUCKS! i searched the site best i could. anyone able to give me some hopium would be appreciated