I dropped my amazon fire HD 8 in soapy water

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The very first step I would take is to disassemble your Fire HD. Use this guide to at least get you into your Fire HD. Take a careful and close look at all components and connectors. Truly assess the damage. Look for major corrosion, evaluate the pins in the connectors, etc,. Take a look at all the connectors as well as cable ends. You will have to remove all the EMI shields from the main board. If you do not remove the shields, you are not cleaning the board. Once you get the gross contamination cleaned, use 90%+ isopropyl alcohol and clean your parts some more. For a proper cleaning, use this guide. It was written for an Apple iPhone 3G but it is still pertinent to your device as well. I can not stress the importance of a good cleaning enough, so do it over and over while replacing the alcohol after each cleaning. Do not use compressed air for the cleaning since that can drive liquid as well as corrosion particles into areas that will cause trouble later. Do not use drinking water, if you need to use water, use sterile water. Also, you do not need to leave it to dry for a day. Isopropyl alcohol in higher concentrations will evaporate quickly and dissipate the water. The importance here is the cleaning. It would, of course, be best to get it professionally cleaned with an ultrasonic cleaner. Do not forget to replace the battery. This is a must and not an option. It will fail if you do not take care of it now. After that, reassemble your Fire HD and re-evaluate.

Hi,

The impurities in the water causes corrosion and provides circuit paths for the electricity which were not in the tablet operating design and could damage the components. The corrosion starts immediately and is ongoing until it is completely cleaned away

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First do not try to charge or to turn on your tablet and then remove the battery as soon as possible from the tablet to minimize any further damage.

Then you need to dis-assemble the rest of the tablet and clean all the affected parts using Isopropyl Alcohol 99%+ (available at electronics parts stores) to remove all traces of corrosion and water. If possible do not use "rubbing alcohol" as in some cases this is only 70% IPA or less, can contain additives and is not as effective. If you do have to use it check the label to verify the amount of IPA. The higher the percentage of IPA the better

Here is a link that describes the process. Electronics Water Damage

As always with electronics, especially surface mounted pcb be gentle when handling and especially when brushing away the corrosion. You do not want to remove any components from the board. Remove the shields that may be covering some components as the water may have got in under there. The ends of any flex cables and their connectors need to be cleaned as well

Hopefully after you have done all this the tablet might possibly work correctly again.

Here is the ifixit Amazon Fire HD 8 (8th Gen) Digitizer Replacement guide that may help in opening the tablet.

If this process seems too daunting, take your tablet to a reputable, professional phone repair service, experienced in liquid damage repair and ask for a quote for a repair. If you decide to do this, do it sooner than later.