If you're using react-select you can try to pass null to value prop.

For example:

import React from "react";
import { render } from "react-dom";
import Select from "react-select";

class App extends React.Component {
  constructor(props) {
    super(props);

    const options = [
      { value: "one", label: "One" },
      { value: "two", label: "Two" }
    ];

    this.state = {
      select: {
        value: options[0], // "One" as initial value for react-select
        options // all available options
      }
    };
  }

  setValue = value => {
    this.setState(prevState => ({
      select: {
        ...prevState.select,
        value
      }
    }));
  };

  handleChange = value => {
    this.setValue(value);
  };

  handleClick = () => {
    this.setValue(null); // here we reset value
  };

  render() {
    const { select } = this.state;

    return (
      <div>
        <p>
          <button type="button" onClick={this.handleClick}>
            Reset value
          </button>
        </p>
        <Select
          name="form-field-name"
          value={select.value}
          onChange={this.handleChange}
          options={select.options}
        />
      </div>
    );
  }
}

render(<App />, document.getElementById("root"));

Here's a working example of this.

I came across this problem myself and managed to fix it by passing a key to the React-Select component, with the selected value appended to it. This will then force the ReactSelect to re-render itself when the selection is updated.

I hope this helps someone.

import ReactSelect from 'react-select';

...

<ReactSelect
  key={`my_unique_select_key__${selected}`}
  value={selected || ''}
  ...
/>

You can clear the value of react select using the ref.

import React, { useRef } from "react";
import Select from "react-select";

export default function App() {
  const selectInputRef = useRef();

  const onClear = () => {
    selectInputRef.current.select.clearValue();
  };

  return (
    <div className="App">
      <h1>Select Gender</h1>
      <Select
        ref={selectInputRef}
        options={[
          { value: "male", label: "Male" },
          { value: "female", label: "Female" }
        ]}
      />
      <button onClick={onClear}>Clear Value</button>
    </div>
  );
}

Here is the CodeSandbox link