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Foam Cannon + Pressure Washer...that all i need?

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>Remember that when you drive on the freeway, it's like a giant blower.

We live a half mile from a four-lane with very little traffic. I usually follow a wash with a mile or two of freeway driving.

Until I get my equipment, how do those self-service car washes compare to the options above in terms of the pressure from the sprayer (won't use the foam brush)?
 
Depending where you live and if your dirt is caked on dirt or just loose dust a pressure washer and foam cannon alone may work for you. In my climate it's not really viable, there is a layer of dirt underneath that needs something more to be removed. It rains almost 200 days out of the year here so I also want a product that helps beading to keep my car clean for at least a few days, maybe even a week if I'm lucky. Today I just washed it today with the following process after about 2 months of winter storms and being too lazy to clean my car.

1: Touchless powerwash with foam cannon for about 5 minutes, then about 5 minutes with a clean rinse. This is just really quick to get the worst of the dirt off, leave debris, etc. Also I was sure to spray the undercarriage as much to get rid of any salt residue kicked up.
2: Went for a spirited drive for 15-20 minute to get the worst of the water off. I'm too lazy to do it by hand or with an air blower and this is way more fun!
3: I then use sanzo waterless car wash spray on the whole car, one panel at a time. First you wipe off the dirt with a "wet" microfiber, then follow up a buff with a clean "dry" rag. The finish it leaves is amazing, almost wax like, although it only lasts about a week.
4: Tire shine, interior detail, vacuum, wipe down surfaces, and glass. This is the easy part, except glass, I hate doing glass.

Final results from today (about 1.5 hours work)

OrW-IMwXj1EXDNtMnZ6LTyDXeXn15dyEpb1qVZgeuIqhbIJ_oNTTISKskv1lerD7E_CKFrN9GtPV08z2VOb36zLZRv6LRUKe_KArhD2A7Oy5WX1dFE5tWoh0aVDz0XpHr8rzN9QhrCd1AK1hm0g0sOW7_NWtWM7IibhYe8fHv8uSZEX795p7b6yiVBBlC_gkyD3ah8X2pJcksgTPA_qis5bBscQtsJF4wo4reLZxxV6qzULRbzoyHKUnXngFG_NkO9ugPLXbbfjWE0CbzwqPvCtDfCuRgddSLjgv2NrFYbRz9e6zxTwGpdLo2GduDlul_qkMiAIMOVLWvx9nTV04od7x820rVMkshQWbejdq6EXwHCww2D7hQUxdqj_M7xt5RxEuJfWaejTFy4Nrn3vbeDVQVYsrAWTEIxgOP_KKkhYfedXfURF8l9wU2JuqbAMYvPXjloGzNgFH81oeoRC4m4p6lqcrPjt2RlG1XmXTUZde5ou_Ijpk-elDDyaGni4qXXZPlU1zS7siwGJx7mGDMG0t6f07FjUhanUXYA8ClNMWaCWkquKgGwnkxZ7MgdNn2WWbEs0ZP41jl4rEvZNxofROAOHCoa6GOIpfP5-PYdaHikdfFNUL9erbhZDUm3EOAKmCn9Yo95tV1pEPMsa_aMd4uJvRr7F8LAI79rZ99K0kMWAKUhOS-Q=w1259-h944-no

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