Its salvageable. The 190 needs to be taken apart and and cleaned out first. The case where corrosion is found can be cleaned with  baking soda rub down and rinsed out with water and then alcohol. The power supply circuit (the part under the track pad between the hard drive and battery) should be cleaned like a regular board - acetone and then alcohol. The battery is toast.

Talk with td4dotnet, he restored a PB190 with simillar if not worst condition than yours. His thread is on:

https://68kmla.org/forums/index.php?/topic/23620-pb190-acid-attack-victim/