but every time after I receive an airdrop I need to add the specific info of the token into myeth wallet or these info are synch automatically?
I just use ethplorer to look at balances and don't bother adding the contract details. You can see them all on etherscan or ethplorer anyways if you want to copy and paste the contract/decimal details. Faster rather than adding lots of different airdrop details non stop. Same with tokens on the waves platform, for that i use wavesexplorer.com.
Hmmm I don't urdenstand well this, do you mean that there is easier way then adding all new coins one by one on MEW or other ETH wallets? Right now I'm searching for details on page/topic/ethxplorer and manually add them to MEW.
No, there isn`t an easier way to add new coins in MEW, you have to do this manually for each coin - the advice was not to bother to add them since you can see all the coins you recived if you just check your wallet on etherscan or ethexplorer:
https://ethplorer.io/address/XXXXXXXXXXX or
https://etherscan.io/address/XXXXXXXXXXX (put your MEW instead of all that X).
There are many airdrops and you don`t even know for sure that you`ll receive tokens from all of them, so it could be a waste of time to add all the tokens manually.