From what you are describing it seems to be folded steal not wootz. Either way, sand is too rough and would leave lines in the blade. For cleaning I use a scrub pad (Scotch pad) and oil, it takes a long time to clean but it does not scratch the blade. If you do a simple search, there are a few very good articles on this forum on how to etch a blade. From the pics you still have a very long way to go before trying a etch.
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