I am resorting to either hooking up a bunch of l298n motor controllers in parallel
L298 h-bridge ICs should -not- be paralleled (beyond their designed paralleling capability per IC to get 4 amps to a single motor) - they have a bipolar transistor output stage, and as such they really won't like being paralleled...
of using esc's from an rc car that has no brake function.
Most ESCs sold today are for brushless (BLDC) motors - if you do go the ESC route, make sure you get ones for brushed motors (which your wiper motors are likely using).
Lastly - since wiper motors turn fairly slowly - could you instead use a DPDT relay (or a pair of SPDT relays)? Or - if you need PWM speed control - use the relay(s) for direction control, and put an NPN or N-channel mosfet on the low-side (between the relay h-bridge and ground) - and drive it with PWM. Just make sure you turn off the PWM before switching the relay(s) - otherwise arcing at the relay contacts will occur. You can easily find logic-level mosfets with the current rating needed. Use automotive relays for the needed amperage.