Will an underbody flush wash away blaster surface shield rust protectant?

[stannypack]

I usually go to this touchless car wash (alternating with an actual detailer), 3 of the 4 options include an underbody flush. Is this fine if I've used blaster surface shield rust protectant all under the car?

main concern is it washing it all off
(I'm near DC so 0 snow so far but just wanting to take precaution so my car doesn't fall apart from rust )

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[horsepower addiction]

none of that stuff is good for your car. do it your self or have a quality detailer do it.

 

[stannypack]

none of that stuff is good for your car. do it your self or have a quality detailer do it.

I clean my car every 2-3 weeks, alternating with an actual hand detail and this touchless wash

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